I gues you are talking about a second board, don&#39;t think youl&#39;ll be putitng a 9.0 on a K87/97...

Had the C111 is fast but not fun and not as fast as the ST
ST104 or ST93 fast, chop okay, but not jumpy jumpy
K86 not as fast but oh man, fun fun fun, jumpy gyby
I weigh ~ 80 was out nwow 7 times on my new K86 in 4.2-5.0 conditions (flat water and waves) and am most happy. Had ST104, was happy too but fun wise -> K86. You might have to get another fin, K86 came with two fins (300 freride and 240? wave), K87 comes with one (between the size of the K86 freeride and wave) or still with two since the first board usually get the old fins from the previous model...